76 



Proceedings op the 



Rainfali, and Run-off During January, February, and 

 March, 1900. 



Run-off Run-off in 



per square percentage of 



mile. precipitation. 



Acre feet. Percent. 



452- 35 



428- 33 



557- 43 



828- 



95 



"The most striking feature of this table as compared 

 with the previous one is the uniformly large run-off 

 as compared with the rainfall. This clearly shows 

 the enormous amount of water taken up by a dry soil, 

 either forested or non-forested, as compared with 

 one already nearly filled to saturation. During the 

 three months here noted, on the forested basins about 

 three-eighths of the rainfall appeared in the run-off. 



Rapidity of Decrease in Run-off After the Close of the 

 Rainy Season. 



Area of Condition 



Pre- April May June 



cipita- run-off run-off run-off 



tion. per sq. m. per sq. m. per sq. m. 



Inches. Acre feet. Acre feet. Acre feet. 



1.6 153- 66- 25- 



1.6 146- 70- 30- 



1.6 166- 74— 30— 



I 56— 2— o 



"The above table clearly shows the importance of 

 forests in sustaining the flow of mountain streams. 

 The three forested catchment areas, which, during 

 December, experienced a run-off of but 5 per cent, 

 of the heavy precipitation for that month and which 



